/**
 * Navit, a modular navigation system.
 * Copyright (C) 2005-2011 Navit Team
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA  02110-1301, USA.
 */
#include <stdio.h>
#include <string.h>
#include "maptool.h"
#ifdef _MSC_VER
#define strcasecmp _stricmp
#endif

char *osm_tag_value(struct item_bin *ib, char *key) {
    char *tag=NULL;
    int len=strlen(key);
    while ((tag=item_bin_get_attr(ib, attr_osm_tag, tag))) {
        if (!strncmp(tag,key,len) && tag[len] == '=')
            return tag+len+1;
    }
    return NULL;
}

#if 0
static char *osm_tag_name(struct item_bin *ib) {
    return osm_tag_value(ib, "name");
}
#endif

osmid boundary_relid(struct boundary *b) {
    long long *id;
    if (!b)
        return 0;
    if (!b->ib)
        return 0;
    id=item_bin_get_attr(b->ib, attr_osm_relationid, NULL);
    if (id)
        return *id;
    return 0;
}
static void process_boundaries_member(void *func_priv, void *relation_priv, struct item_bin *member,
                                      void *member_priv) {
    struct boundary *b=relation_priv;
    enum geom_poly_segment_type role=(long)member_priv;
    int *dup;
    dup=item_bin_get_attr(member,attr_duplicate,NULL);
    if(!dup || *dup==0)
        b->segments=g_list_prepend(b->segments,item_bin_to_poly_segment(member, role));
}

static GList *process_boundaries_setup(FILE *boundaries, struct relations *relations) {
    struct item_bin *ib;
    GList *boundaries_list=NULL;
    struct relations_func *relations_func;

    relations_func=relations_func_new(process_boundaries_member, NULL);
    while ((ib=read_item(boundaries))) {
        char *member=NULL;
        struct boundary *boundary=g_new0(struct boundary, 1);
        char *admin_level=osm_tag_value(ib, "admin_level");
        char *iso=osm_tag_value(ib, "ISO3166-1");
        int has_subrelations=0;
        int has_outer_ways=0;

        processed_relations++;

        if(!iso)
            iso=osm_tag_value(ib, "iso3166-1:alpha2");

        if (!g_strcmp0(admin_level, "2")) {
            if(!iso) {
                char *int_name=osm_tag_value(ib,"int_name");
                if(!g_strcmp0(int_name,"France"))
                    iso="FR";
            }
            if (iso) {
                struct country_table *country=country_from_iso2(iso);
                if (!country)
                    osm_warning("relation",item_bin_get_relationid(ib),0,"Country Boundary contains unknown ISO3166-1 value '%s'\n",iso);
                else {
                    boundary->iso2=g_strdup(iso);
                    osm_info("relation",item_bin_get_relationid(ib),0,"Country Boundary for '%s'\n",iso);
                }
                boundary->country=country;
            } else
                osm_warning("relation",item_bin_get_relationid(ib),0,"Country Boundary doesn't contain an ISO3166-1 tag\n");
        }
        while ((member=item_bin_get_attr(ib, attr_osm_member, member))) {
            long long osm_id;
            int read=0;
            enum relation_member_type member_type;
            int member_type_numeric;
            char *rolestr;

            if (sscanf(member,RELATION_MEMBER_PARSE_FORMAT,&member_type_numeric,&osm_id,&read) < 2)
                continue;

            member_type=(enum relation_member_type)member_type_numeric;
            rolestr=member+read;

            if(member_type==rel_member_node) {
                if(!g_strcmp0(rolestr,"admin_centre") || !g_strcmp0(rolestr,"admin_center"))
                    boundary->admin_centre=osm_id;
            }
            if(member_type==rel_member_way) {
                enum geom_poly_segment_type role;
                if (!g_strcmp0(rolestr,"outer") || !g_strcmp0(rolestr,"exclave")) {
                    has_outer_ways=1;
                    role=geom_poly_segment_type_way_outer;
                } else if (!g_strcmp0(rolestr,"inner") || !g_strcmp0(rolestr,"enclave"))
                    role=geom_poly_segment_type_way_inner;
                else if (!g_strcmp0(rolestr,""))
                    role=geom_poly_segment_type_way_unknown;
                else {
                    osm_warning("relation",item_bin_get_relationid(ib),0,"Unknown role %s in member ",rolestr);
                    osm_warning("way",osm_id,1,"\n");
                    role=geom_poly_segment_type_none;
                }
                relations_add_relation_member_entry(relations, relations_func, boundary, (gpointer)role, rel_member_way, osm_id);
            }
            if(member_type==rel_member_relation) {
                if (!g_strcmp0(rolestr,"outer") || !g_strcmp0(rolestr,"exclave") || !g_strcmp0(rolestr,"inner")
                        || !g_strcmp0(rolestr,"enclave"))
                    has_subrelations++;
            }
        }
        if(boundary->iso2 && has_subrelations)
            osm_warning("relation",item_bin_get_relationid(ib),0,
                        "Country boundary '%s' has %d relations as boundary segments. These are not supported yet.\n", boundary->iso2,
                        has_subrelations);
        if(boundary->iso2 && !has_outer_ways) {
            osm_warning("relation",item_bin_get_relationid(ib),0,
                        "Skipping country boundary for '%s' because it has no outer ways.\n", boundary->iso2);
            g_free(boundary->iso2);
            boundary->iso2=NULL;
        }

        boundary->ib=item_bin_dup(ib);
        boundaries_list=g_list_append(boundaries_list, boundary);
    }
    return boundaries_list;
}

GList *boundary_find_matches(GList *l, struct coord *c) {
    GList *ret=NULL;
    while (l) {
        struct boundary *boundary=l->data;
        if (bbox_contains_coord(&boundary->r, c)) {
            if (geom_poly_segments_point_inside(boundary->sorted_segments,c) > 0)
                ret=g_list_prepend(ret, boundary);
            ret=g_list_concat(ret,boundary_find_matches(boundary->children, c));
        }
        l=g_list_next(l);
    }
    return ret;
}

#if 0
static void test(GList *boundaries_list) {
    struct item_bin *ib;
    FILE *f=fopen("country_276.bin.unsorted","r");
    printf("start\n");
    while ((ib=read_item(f))) {
        struct coord *c=(struct coord *)(ib+1);
        char *name=item_bin_get_attr(ib, attr_town_name, NULL);
        printf("%s:",name);
        boundary_find_matches(boundaries_list, c);
        printf("\n");
    }
    fclose(f);
    printf("end\n");
}

static void dump_hierarchy(GList *l, char *prefix) {
    char *newprefix=g_alloca(sizeof(char)*(strlen(prefix)+2));
    strcpy(newprefix, prefix);
    strcat(newprefix," ");
    while (l) {
        struct boundary *boundary=l->data;
        fprintf(stderr,"%s:%s (0x%x,0x%x)-(0x%x,0x%x)\n",prefix,osm_tag_name(boundary->ib),boundary->r.l.x,boundary->r.l.y,
                boundary->r.h.x,boundary->r.h.y);
        dump_hierarchy(boundary->children, newprefix);
        l=g_list_next(l);
    }
}

static gint boundary_bbox_compare(gconstpointer a, gconstpointer b) {
    const struct boundary *boundarya=a;
    const struct boundary *boundaryb=b;
    long long areaa=bbox_area(&boundarya->r);
    long long areab=bbox_area(&boundaryb->r);
    if (areaa > areab)
        return 1;
    if (areaa < areab)
        return -1;
    return 0;
}
#endif

static GList *process_boundaries_insert(GList *list, struct boundary *boundary) {
    GList *l=list;
    while (l) {
        struct boundary *b=l->data;
        if (bbox_contains_bbox(&boundary->r, &b->r)) {
            list=g_list_remove(list, b);
            boundary->children=g_list_prepend(boundary->children, b);
            l=list;
        } else if (bbox_contains_bbox(&b->r, &boundary->r)) {
            b->children=process_boundaries_insert(b->children, boundary);
            return list;
        } else
            l=g_list_next(l);
    }
    return g_list_prepend(list, boundary);
}


static GList *process_boundaries_finish(GList *boundaries_list) {
    GList *l,*sl;
    GList *ret=NULL;
    l=boundaries_list;
    while (l) {
        struct boundary *boundary=l->data;
        int first=1;
        FILE *f=NULL,*fu=NULL;
        if (boundary->country) {
            char *name=g_strdup_printf("country_%s_poly",boundary->iso2);
            f=tempfile("",name,1);
            g_free(name);
        }
        boundary->sorted_segments=geom_poly_segments_sort(boundary->segments, geom_poly_segment_type_way_right_side);
        sl=boundary->sorted_segments;
        while (sl) {
            struct geom_poly_segment *gs=sl->data;
            struct coord *c=gs->first;
            while (c <= gs->last) {
                if (first) {
                    boundary->r.l=*c;
                    boundary->r.h=*c;
                    first=0;
                } else
                    bbox_extend(c, &boundary->r);
                c++;
            }
            if (f) {
                struct item_bin *ib=tmp_item_bin;
                item_bin_init(ib, type_selected_line);
                /* FIXME check for overflow */
                item_bin_add_coord(ib, gs->first, gs->last-gs->first+1);
                item_bin_write(ib, f);
            }
            if (boundary->country) {
                if (!coord_is_equal(*gs->first,*gs->last)) {
                    struct item_bin *ib;
                    if (!fu) {
                        char *name=g_strdup_printf("country_%s_broken",boundary->iso2);
                        fu=tempfile("",name,1);
                        g_free(name);
                    }
                    ib=tmp_item_bin;
                    item_bin_init(ib, type_selected_point);
                    item_bin_add_coord(ib, gs->first, 1);
                    item_bin_write(ib, fu);
                    item_bin_init(ib, type_selected_point);
                    item_bin_add_coord(ib, gs->last, 1);
                    item_bin_write(ib, fu);
                }
            }
            sl=g_list_next(sl);
        }
        ret=process_boundaries_insert(ret, boundary);
        l=g_list_next(l);
        if (f)
            fclose(f);
        if (fu) {
            if (boundary->country)
                osm_warning("relation",item_bin_get_relationid(boundary->ib),0,"Broken country polygon '%s'\n",boundary->iso2);
            fclose(fu);
        }

    }
    return ret;
}

GList *process_boundaries(FILE *boundaries, FILE *ways) {
    GList *boundaries_list;
    struct relations *relations=relations_new();

    boundaries_list=process_boundaries_setup(boundaries, relations);
    relations_process(relations, NULL, ways);
    relations_destroy(relations);
    return process_boundaries_finish(boundaries_list);
}

void free_boundaries(GList *bl) {
    GList *l=bl;
    while (l) {
        struct boundary *boundary=l->data;
        GList *s=boundary->segments;
        while (s) {
            struct geom_poly_segment *seg=s->data;
            g_free(seg->first);
            g_free(seg);
            s=g_list_next(s);
        };
        s=boundary->sorted_segments;
        while (s) {
            struct geom_poly_segment *seg=s->data;
            g_free(seg->first);
            g_free(seg);
            s=g_list_next(s);
        };
        g_list_free(boundary->segments);
        g_list_free(boundary->sorted_segments);
        g_free(boundary->ib);
        g_free(boundary->iso2);
        free_boundaries(boundary->children);
        g_free(boundary);
        l=g_list_next(l);
    }
    g_list_free(bl);
}
